@joeo10 done. Feature is added. Use the "Quotation" post type to pull in a podcast episode from an external source.
There are some situations where big podcasting networks don't surface their audio files in a logical or consistent manner. 99% Invisible is one example from many where some very special code will need to be written to work out what the audio file actually is. However, a good number of the podcasts that I tried did get pulled in properly and they can be played directly from the Social client or on the personal site as one would expect.
I should probably mention that the audio file is not pulled in to 10C. Instead, it's just streamed from the source location. If there are places that block this sort of activity, then we'll have to look at custom handling for certain situations.